After a thorough review of the literature, Tullis … [Ph.D. Univ. of Kansas, 1984] … [% of screen filled], 2. Local density: [weighted] Average number of filled character spaces … 3. Grouping: (1) Number of groups of "connected" … (2) Average visual angle subtended by groups … 4. Layout complexity … [p. 333] [In comparing 520 different displays,] A multiple regression using the first … A multiple regression using all the measures explained …
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